In World of Warcraft, altogether there are ten races and nine classes available so you have many choices to decide your character when launching in this world. However, the game's most important choice when you create your character is which faction you wish to fight for. You can join the Horde or the Alliance, and your choice here determines much of what you can and cannot accomplish in the world.
In this WOW game world, you can only group and talk to players in your own faction and you also can only view and befriend players in your faction when using the in-game social commands. This is to make you feel like a member of one enormous team, while at the same time setting up the other faction as an enemy or, at best, a rival.
Thus, you will just wish to join in factions the same to yours when you want to play with your friends. Meanwhile, the faction also organizes other contents, such as the zones you can visit and the quests you can accomplish. However, some quests can only be completed by Horde players and others can only be completed by Alliance players. It is possible there are cities and interactive NPCs offered in some zones for one faction, but they are completely closed to the other.
With this guide introduction, players should make a choice that which character you want to choose to play. Have a clear idea and you may get WOW GOLD and WOW Powerleveling much easier.